A Method of Reducing the Effect of Residual Reflections in an Anechoic Chamber on the Measurement Precision of the Group Delay in an Antenna
- 17 Downloads
It has been shown that methods currently being used for measuring group delay in an antenna in an anechoic chamber are limited in precision due to the effect of residual reflections. A method has been developed to decrease the effect of reflections, with a linear approximation for the effect of a delay on the distance between antennas. The method is based on the assumption that the group delay between the input of the radiating antenna and the output of the receiving antenna in the far-field region depends linearly on the distance between antennas, and the interference caused by the residual reflections is of periodic nature. The method that was developed, compared with the method of determining the delay for a fixed distance that was used previously, made it possible to improve the precision of measurement by a factor of greater than 6.
Keywordsanechoic chamber group delay GNSS antenna GLONASS
- 1.GOST R 8.773-2011, GSI. Antennas of a Navigation User’s Global Satellite System. Standardized Electric Parameters and Methods of Measurements. Google Scholar
- 2.Global Navigational Satellite System GLONASS. Interface Management Document. The Navigational RF Signal in the L1, L2 Ranges (ed. 5.1), Research Institute for Space Device Engineering, Moscow (2008), http://russianspacesystems.ru/wpcontent/uploads/2016/08/ICD_GLONASS_rus_v5.1.pdf, acc. 05.25.2018.
- 3.A. Proia, G. Cibiel, J. White, et al., “Absolute calibration of GNSS time transfer systems: NRL and CNES techniques comparison,” in Frequency Control and the European Frequency and Time Forum (FCS): 2011 Joint Conf. of the IEEE International, May 2–5, 2011.Google Scholar
- 4.N. R. Bazhenov and I. M. Malai, “The use of the results of the certifi cation of radio anechoic chambers when estimating the accuracy of measurements of the characteristics of user navigation apparatus,” Izmer. Tekhn., No. 5, 61–63 (2015).Google Scholar
- 5.B. B. Tian, Free Space VSWR Method for Anechoic Chamber Electromagnetic Performance Evaluation. MI Technologies, www.mitechnologies.com, acc. 05.20.2018.
- 6.V. A. Tishchenko, V. I. Tokatly, V. I. Luk’yanov, and N. R. Bazhenov, “Investigation of the fi eld of a thin biconical antenna in generation mode,” Izmer. Tekhn., No. 10, 43–48 (2011).Google Scholar